linux-kernel - Re: [PATCH] ice1712: fix: lock samplerate when samplerate locking is enabled.

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Date:	Thu, 04 Feb 2010 09:30:36 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Sebastien Alaiwan <sebastien.alaiwan@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ice1712: fix: lock samplerate when samplerate locking is enabled.

At Wed, 03 Feb 2010 21:45:34 +0100,
Sebastien Alaiwan wrote:
> 
> Hello,
> 
> I found that the sampling rate locking setting of the ice1712 sound driver was
> only half-respected : when the driver was locked to, let's say, 44100Hz, and a
> usermode app was requesting 48000Hz playback, the request was succesful although
> the soundcard would continue to run at 44100Hz.
> 
> Here's a patch that will make those requests to fail.

Thanks, the patch looks OK.  But changing runtime->hw.rate_min and
rate_max would be cheaper.  It won't involve with kmalloc().
In theory, snd_pcm_hw_constraint*() can fail.

Could you fix in that way and give your sign-off to merge to the
upstream?  (And don't forget to add me to Cc.)


thanks,

Takashi


> diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
> index c7cff6f..4775626 100644
> --- a/sound/pci/ice1712/ice1712.c
> +++ b/sound/pci/ice1712/ice1712.c
> @@ -1181,6 +1181,8 @@ static int snd_ice1712_playback_pro_open(struct snd_pcm_substream *substream)
>  	snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
>  	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
>  
> +	if (is_pro_rate_locked(ice))
> +		snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, PRO_RATE_DEFAULT, PRO_RATE_DEFAULT);
>  	if (ice->spdif.ops.open)
>  		ice->spdif.ops.open(ice, substream);
>  
> @@ -1197,6 +1199,9 @@ static int snd_ice1712_capture_pro_open(struct snd_pcm_substream *substream)
>  	snd_pcm_set_sync(substream);
>  	snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
>  	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
> +	if (is_pro_rate_locked(ice))
> +		snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, PRO_RATE_DEFAULT, PRO_RATE_DEFAULT);
> +
>  	return 0;
>  }
>  
> --
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